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In a particular isomer of [Co(NH3)4Cl2]+, the Cl-Co-Cl angle is 90°, the isomer is known as:

1. Linkage isomer
2. Optical isomer
3. cis-isomer
4. Position isomer

Correct answer: cis-isomer

Solution

The Cl-Co-Cl angle being 90° indicates that the two chloride ligands are adjacent to each other, which is characteristic of the cis-isomer in coordination compounds.

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